openwrt/target/utils/src/motorola-bin.c

   1 /*
   2  * motorola-bin.c
   3  *
   4  * Copyright (C) 2005-2006 Mike Baker,
   5  *                         Imre Kaloz <kaloz@openwrt.org>
   6  *                         OpenWrt.org
   7  *
   8  * $Id$
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * as published by the Free Software Foundation; either version 2
  13  * of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  23  *
  24  */
  25
  26 /*
  27  * February 1, 2006
  28  *
  29  * Add support for for creating WA840G and WE800G images
  30  */
  31
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34 #include <unistd.h>
  35 #include <fcntl.h>
  36 #include <sys/mman.h>
  37 #include <string.h>
  38 #include <netinet/in.h>
  39
  40 unsigned long *crc32;
  41
  42 void init_crc32()
  43 {
  44     unsigned long crc;
  45     unsigned long poly = ntohl(0x2083b8ed);
  46     int n, bit;
  47     if ((crc32 = (unsigned long *) malloc(256 * sizeof(unsigned long))) == (void *)-1) {
  48        perror("malloc");
  49        exit(1);
  50     }
  51     for (n = 0; n < 256; n++) {
  52         crc = (unsigned long) n;
  53         for (bit = 0; bit < 8; bit++)
  54             crc = (crc & 1) ? (poly ^ (crc >> 1)) : (crc >> 1);
  55         crc32[n] = crc;
  56     }
  57 }
  58
  59 unsigned int crc32buf(char *buf, size_t len)
  60 {
  61     unsigned int crc = 0xFFFFFFFF;
  62     for (; len; len--, buf++)
  63         crc = crc32[(crc ^ *buf) & 0xff] ^ (crc >> 8);
  64     return crc;
  65 }
  66
  67 struct motorola {
  68         unsigned int crc;       // crc32 of the remainder
  69         unsigned int flags;     // unknown, 105770*
  70         char *trx;              // standard trx
  71 };
  72
  73 void usage(void) __attribute__ (( __noreturn__ ));
  74
  75 void usage(void)
  76 {
  77         printf("Usage: motorola-bin [-device] [trxfile] [binfile]\n\n");
  78         printf("Known devices: 1 - WR850G | 2 - WA840G | 3 - WE800G\n");
  79         exit(1);
  80 }
  81
  82 int main(int argc, char **argv)
  83 {
  84         unsigned int len;
  85         int fd;
  86         int c;
  87         void *trx;
  88         struct motorola *firmware;
  89
  90         // verify parameters
  91
  92         if (argc!=4)
  93         {
  94         usage();
  95         }
  96
  97         // mmap trx file
  98         if (((fd = open(argv[2], O_RDONLY))  < 0)
  99         || ((len = lseek(fd, 0, SEEK_END)) < 0)
 100         || ((trx = mmap(0, len, PROT_READ, MAP_SHARED, fd, 0)) == (void *) (-1))
 101         || (close(fd) < 0)) {
 102                 perror("open/malloc");
 103                 exit(1);
 104         }
 105
 106         // create a firmware image in memory
 107         // and copy the trx to it
 108         firmware = malloc(len+8);
 109         memcpy(&firmware->trx,trx,len);
 110         munmap(trx,len);
 111
 112         // setup the motorola headers
 113         init_crc32();
 114
 115         // setup the firmware magic
 116
 117         while ((c = getopt(argc, argv, "123")) !=-1) {
 118                 switch (c) {
 119                         case '1':
 120                                 firmware->flags = ntohl(0x10577050); // Motorola WR850G
 121                                 break;
 122                         case '2':
 123                                 firmware->flags = ntohl(0x10577040); // Motorola WA840G
 124                                 break;
 125                         case '3':
 126                                 firmware->flags = ntohl(0x10577000); // Motorola WE800G
 127                                 break;
 128                         default:
 129                                 usage();
 130                 }
 131         }
 132
 133         firmware->crc   = htonl(crc32buf((char *)&firmware->flags,len+4));
 134
 135         // write the firmware
 136         if (((fd = open(argv[3], O_CREAT|O_WRONLY,0644)) < 0)
 137         || (write(fd,firmware,len+8) != len+8)
 138         || (close(fd) < 0)) {
 139                 perror("write");
 140                 exit(-1);
 141         }
 142
 143         free(firmware);
 144
 145         return 0;
 146 }